views:

94

answers:

2

In background.html,I want to get current web page dom. such as "getElementById()

A: 

Hit CTRL+SHIFT+I for the developer UI oder CTRL+U for the source

Micheal Werner
I is developing chrome extension ,not view web page..
Gio
+1  A: 

Hi Gio,

To do this, you would need to use Message Passing. Message passing is needed to allow you to communicate to the DOM, and the only way to communicate to the DOM is through Content-Scripts. I will show you two ways which you can do this:

Method 1

Having every visited page listen for an extension request

background.html

<html>
<script>
chrome.tabs.getSelected(null, function(tab) {
  chrome.tabs.sendRequest(tab.id, {method: "getHTML"}, function(response) {
    console.log(response.data);
  });
});
</script>
</html>

content_script.js

chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
    if (request.method == "getHTML")
      sendResponse({data: document.getElementById('header').innerHTML});
    else
      sendResponse({}); // snub them.
});

Method 2

Only execute a content script whenever you need to:

background.html

<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab) {
  chrome.tabs.executeScript(tab.id, {file: 'execute.js'});
});

chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
  console.log('Data Recieved: ' + request.data);
});
</script>
</html>

execute.js

chrome.extension.sendRequest({data: document.getElementById('header').innerHTML});
Mohamed Mansour

related questions